CN211293078U - Impedance scanning system of coupling harmonic - Google Patents
Impedance scanning system of coupling harmonic Download PDFInfo
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- CN211293078U CN211293078U CN201920663127.XU CN201920663127U CN211293078U CN 211293078 U CN211293078 U CN 211293078U CN 201920663127 U CN201920663127 U CN 201920663127U CN 211293078 U CN211293078 U CN 211293078U
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Abstract
The utility model discloses an impedance scanning system of coupling harmonic waves, which comprises a man-machine interaction interface and an impedance scanning device; the human-computer interaction interface is connected with the input end of the impedance scanning device, the output end of the impedance scanning device is connected with the system to be detected, and the impedance scanning device comprises an ARM processor, a digital signal processing device, a digital-to-analog conversion device, an analog-to-digital conversion device and a signal generating and collecting device based on a real-time digital simulator; one end of the ARM processor is connected with the input end of the impedance scanning device, the other end of the ARM processor is connected with the two-way end of the digital signal processing device, the output end of the digital signal processing device is connected with the input end of the digital-to-analog conversion device, the output end of the digital-to-analog conversion device is connected with the input end of the signal generation and acquisition device based on the real-time digital simulator, and the two-way end of the signal generation and acquisition device based on the real-time digital simulator is connected with the output end. And impedance information is accurately acquired, and the stability analysis accuracy of the system to be detected is improved.
Description
Technical Field
The utility model relates to an electric power system technical field especially relates to an impedance scanning system of coupling harmonic.
Background
With the large-scale application of the flexible direct-current transmission system, the oscillation phenomenon is observed in most flexible direct-current transmission systems, the frequency range of the oscillation phenomenon is different from several hertz to several kilohertz, the oscillation phenomenon occurs in each frequency interval and is influenced by the system structure, the operation state and the dynamic characteristic of a controller, the oscillation mechanism is complex and variable, and little difficulty is brought to the analysis of the oscillation phenomenon. At present, most of the analysis methods for the oscillation phenomena adopt an impedance analysis method, and the stability of the flexible direct current transmission system is further analyzed by obtaining an impedance curve of the flexible direct current transmission system at the steady-state working point. Under the condition that the system structure, the operation state and the dynamic characteristic of the controller are definite, the impedance curve of the system to be detected can be obtained through the impedance theoretical model, and the impedance curve is generally obtained through the impedance scanning device.
However, when the traditional impedance scanning device is used for analyzing a system to be detected with obvious coupling characteristics, impedance information cannot be accurately acquired, and the stability analysis accuracy of the system to be detected is improved.
Disclosure of Invention
The utility model aims at providing an impedance scanning system of coupling harmonic when waiting to detect the system to the coupling characteristic is obvious and analyzing, can effectively accurately acquire impedance information, improves the degree of accuracy that waits to detect the system stability analysis.
In order to solve the above technical problem, an embodiment of the present invention provides an impedance scanning system for coupling harmonics, including a human-computer interaction interface and an impedance scanning device for generating an impedance curve; the human-computer interaction interface is connected with the input end of the impedance scanning device, and the output end of the impedance scanning device is connected with the system to be detected; the impedance scanning device comprises an ARM processor, a digital signal processing device, a digital-to-analog conversion device, an analog-to-digital conversion device and a signal generating and collecting device based on a real-time digital simulator; one end of the ARM processor is connected with the input end of the impedance scanning device, the other end of the ARM processor is connected with the two-way end of the digital signal processing device, the output end of the digital signal processing device is connected with the input end of the digital-to-analog conversion device, the output end of the digital-to-analog conversion device is connected with the input end of the signal generation and acquisition device based on the real-time digital simulator, the two-way end of the signal generation and acquisition device based on the real-time digital simulator is connected with the output end of the impedance scanning device, the output end of the signal generation and acquisition device based on the real-time digital simulator is connected with the input end of the analog-to-digital conversion device, and the output end of the analog-to-digital conversion device is connected with the input end of the digital.
Preferably, the digital signal processing device is an FPGA logic device.
Preferably, the digital-to-analog conversion device is a digital-to-analog converter.
Preferably, the analog-to-digital conversion device is an analog-to-digital converter.
Compared with the prior art, the embodiment of the utility model provides a pair of impedance scanning system of coupling harmonic's beneficial effect lies in: the impedance scanning system of the coupled harmonic comprises a human-computer interaction interface and an impedance scanning device for generating an impedance curve; the human-computer interaction interface is connected with the input end of the impedance scanning device, and the output end of the impedance scanning device is connected with the system to be detected; the impedance scanning device comprises an ARM processor, a digital signal processing device, a digital-to-analog conversion device, an analog-to-digital conversion device and a signal generating and collecting device based on a real-time digital simulator; one end of the ARM processor is connected with the input end of the impedance scanning device, the other end of the ARM processor is connected with the two-way end of the digital signal processing device, the output end of the digital signal processing device is connected with the input end of the digital-to-analog conversion device, the output end of the digital-to-analog conversion device is connected with the input end of the signal generation and acquisition device based on the real-time digital simulator, the two-way end of the signal generation and acquisition device based on the real-time digital simulator is connected with the output end of the impedance scanning device, the output end of the signal generation and acquisition device based on the real-time digital simulator is connected with the input end of the analog-to-digital conversion device, and the output end of the analog-to-digital conversion device is connected with the input end of the digital. The method comprises the steps that a sweep frequency signal and a coupling frequency harmonic signal are set on a human-computer interaction interface, the coupling frequency harmonic signal is injected into a system to be detected through the impedance scanning device, the voltage and current signals of the system to be detected after the coupling frequency harmonic signal is injected are collected, the human-computer interaction interface calculates and displays an impedance curve of the system to be detected according to information fed back by the impedance scanning device, impedance information is effectively and accurately obtained, and the accuracy of stability analysis of the system to be detected is improved.
Drawings
Fig. 1 is a schematic structural diagram of an impedance scanning system for coupling harmonics according to an embodiment of the present invention.
Wherein the reference numbers in the drawings of the specification are as follows:
1. a human-computer interaction interface;
2. an impedance scanning device; 21. an ARM processor; 22. a digital signal processing device; 23. a digital-to-analog conversion device; 24. an analog-to-digital conversion device; 25. a signal generating and collecting device based on a real-time digital simulator.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Please refer to fig. 1, which is a schematic structural diagram of an impedance scanning system for coupling harmonics according to an embodiment of the present invention, the impedance scanning system for coupling harmonics includes a human-computer interface 1 and an impedance scanning apparatus 2 for generating an impedance curve; the human-computer interaction interface 1 is connected with the input end of the impedance scanning device 2, and the output end of the impedance scanning device 2 is connected with a system to be detected; the impedance scanning device 2 comprises an ARM processor 21, a digital signal processing device 22, a digital-to-analog conversion device 23, an analog-to-digital conversion device 24 and a signal generating and collecting device 25 based on a real-time digital simulator; one end of the ARM processor 21 is connected to the input end of the impedance scanning device 2, the other end of the ARM processor 21 is connected to the bidirectional end of the digital signal processing device 22, the output end of the digital signal processing device 22 is connected to the input end of the digital-to-analog conversion device 23, the output end of the digital-to-analog conversion device 23 is connected to the input end of the signal generation and acquisition device 25 based on the real-time digital simulator, the bidirectional end of the signal generation and acquisition device 25 based on the real-time digital simulator is connected to the output end of the impedance scanning device 2, the output end of the signal generation and acquisition device 25 based on the real-time digital simulator is connected to the input end of the analog-to-digital conversion device 24, and the output end of the analog-to-digital conversion device 24 is connected to the input end of the digital signal processing device 22.
In this embodiment, because the conventional impedance scanning device 2 has the defects of insufficient precision, incapability of expressing the coupling characteristics and the like when analyzing the system to be detected with obvious coupling characteristics, the human-computer interaction interface 1 is used for setting a sweep frequency signal and coupling frequency harmonics, and the coupling frequency harmonics are injected into the system to be detected to obtain an impedance coupling characteristic curve of the system to be detected, so that the precision of the impedance coupling characteristics of the system to be detected is further improved, and a basis is provided for analyzing the stability of the system to be detected. Wherein, the injected coupling frequency harmonic needs to satisfy the coupling characteristic, generally the sum of the angular velocities of the injected first coupling frequency harmonic and the second coupling frequency harmonic is equal to 2 times of the fundamental angular velocity; the injection coupling frequency harmonic amplitude needs to be small enough not to cause the change of the steady-state working point of the system; meanwhile, the amplitude of the injected coupling frequency harmonic wave needs to be large enough, and the harmonic wave corresponding to the coupling frequency in the voltage and current signal fed back by the system to be detected can be accurately read.
In this embodiment, the type of the digital signal processing apparatus 22 may also be set according to the actual use condition, and it is only necessary that the digital signal processing apparatus 22 can realize the related functions in this embodiment. In order to further simplify the design and structure and reduce the cost, the digital signal processing device 22 in this embodiment is an FPGA logic device.
In this embodiment, the type of the digital-to-analog conversion device 23 may also be set according to an actual use condition, and it is only necessary that the digital-to-analog conversion device 23 can realize the related functions in this embodiment. In order to further simplify the design and structure and reduce the cost, the digital-to-analog conversion device 23 in this embodiment is a digital-to-analog converter.
In this embodiment, the type of the analog-to-digital conversion device 24 may also be set according to the actual use situation, and it is only necessary that the analog-to-digital conversion device 24 can implement the related functions in this embodiment. In order to further simplify the design and structure and reduce the cost, the analog-to-digital conversion device 24 in this embodiment is an analog-to-digital converter.
In this embodiment, the working process of the impedance scanning system with coupled harmonics is specifically represented as: firstly, configuring a frequency sweep frequency band, a coupling frequency harmonic amplitude, a frequency sweep interval and frequency sweep time parameters through a human-computer interaction interface 1; the digital signal processing device 22 generates a reference signal according to the sweep frequency signal and the coupling frequency harmonic wave set by the human-computer interaction interface 1, inputs the reference signal into the digital signal processing device 22, records the feedback signal of the digital signal processing device 22 according to time, processes the feedback signal in the same way, and outputs the feedback signal back to the human-computer interface; the digital signal processing device 22 generates a digital signal which can be executed by the real-time digital simulator or related hardware according to the reference signal generated by the ARM processor 21; then, the digital-to-analog conversion device 23 generates an analog signal that can be executed by the real-time digital simulator or related hardware according to the digital signal generated by the digital signal processing device 22, the analog signal is input to the signal generation and acquisition device 25 based on the real-time digital simulator, the signal generation and acquisition device 25 based on the real-time digital simulator integrates the acquired voltage and current signal of the system to be detected and the analog signal generated by the digital-to-analog conversion device 23, and outputs the integrated signal to the analog-to-digital conversion device 24, and the analog-to-digital conversion device 24 converts the analog signal obtained by the signal generation and acquisition device 25 based on the real-time digital simulator into a digital signal that can be recognized by the impedance scanning device.
The general man-machine interaction interface 1 is responsible for generating a visual operation interface, a sweep frequency signal and coupling frequency harmonic waves, outputting the signals to the impedance scanning device 2, simultaneously processing a voltage current signal acquired from the impedance scanning device 2 to generate an impedance curve scanning result, then performing impedance curve calculation according to the generated impedance curve scanning result, and generally performing fast algorithm calculation of discrete Fourier transform to obtain impedance characteristics corresponding to the injection coupling frequency harmonic waves.
Compared with the prior art, the embodiment of the utility model provides a pair of impedance scanning system of coupling harmonic's beneficial effect lies in: the impedance scanning system of the coupled harmonic comprises a human-computer interaction interface and an impedance scanning device for generating an impedance curve; the human-computer interaction interface is connected with the input end of the impedance scanning device, and the output end of the impedance scanning device is connected with the system to be detected; the impedance scanning device comprises an ARM processor, a digital signal processing device, a digital-to-analog conversion device, an analog-to-digital conversion device and a signal generating and collecting device based on a real-time digital simulator; one end of the ARM processor is connected with the input end of the impedance scanning device, the other end of the ARM processor is connected with the two-way end of the digital signal processing device, the output end of the digital signal processing device is connected with the input end of the digital-to-analog conversion device, the output end of the digital-to-analog conversion device is connected with the input end of the signal generation and acquisition device based on the real-time digital simulator, the two-way end of the signal generation and acquisition device based on the real-time digital simulator is connected with the output end of the impedance scanning device, the output end of the signal generation and acquisition device based on the real-time digital simulator is connected with the input end of the analog-to-digital conversion device, and the output end of the analog-to-digital conversion device is connected with the input end of the digital. The method comprises the steps that a sweep frequency signal and a coupling frequency harmonic signal are set on a human-computer interaction interface, the coupling frequency harmonic signal is injected into a system to be detected through the impedance scanning device, the voltage and current signals of the system to be detected after the coupling frequency harmonic signal is injected are collected, the human-computer interaction interface calculates and displays an impedance curve of the system to be detected according to information fed back by the impedance scanning device, impedance information is effectively and accurately obtained, and the accuracy of stability analysis of the system to be detected is improved.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (4)
1. An impedance scanning system for coupling harmonic waves is characterized by comprising a human-computer interaction interface and an impedance scanning device for generating an impedance curve; the human-computer interaction interface is connected with the input end of the impedance scanning device, and the output end of the impedance scanning device is connected with the system to be detected; the impedance scanning device comprises an ARM processor, a digital signal processing device, a digital-to-analog conversion device, an analog-to-digital conversion device and a signal generating and collecting device based on a real-time digital simulator; one end of the ARM processor is connected with the input end of the impedance scanning device, the other end of the ARM processor is connected with the two-way end of the digital signal processing device, the output end of the digital signal processing device is connected with the input end of the digital-to-analog conversion device, the output end of the digital-to-analog conversion device is connected with the input end of the signal generation and acquisition device based on the real-time digital simulator, the two-way end of the signal generation and acquisition device based on the real-time digital simulator is connected with the output end of the impedance scanning device, the output end of the signal generation and acquisition device based on the real-time digital simulator is connected with the input end of the analog-to-digital conversion device, and the output end of the analog-to-digital conversion device is connected with the input end of the digital.
2. The harmonic-coupled impedance scanning system of claim 1 wherein the digital signal processing device is an FPGA logic device.
3. The harmonic-coupled impedance scanning system of claim 1 wherein the digital-to-analog conversion device is a digital-to-analog converter.
4. The harmonic-coupled impedance scanning system of claim 1 wherein the analog-to-digital conversion device is an analog-to-digital converter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920663127.XU CN211293078U (en) | 2019-05-09 | 2019-05-09 | Impedance scanning system of coupling harmonic |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920663127.XU CN211293078U (en) | 2019-05-09 | 2019-05-09 | Impedance scanning system of coupling harmonic |
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| CN211293078U true CN211293078U (en) | 2020-08-18 |
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